Field control device



June 23, 1931. R. w. CARLISLE FIELD CONTROL'DEVICE Filed June 29. 1928 to substantially a minimum.

. A further 'bject ofmy invention is to pro- Patented June 23, 1931 UNITED STATES mama w. CABL'I'S'LE'Q'F wnxmsnuac, rs'in rsrwmm, "Assrenoe To wesrme- HOUSE ELECTRIC & MANUFACTURING oo'MrA NY, 'Aconroimricn or rnN'NsYL' VANLA' Ap'pli'c'ation fired nine '29,

My invention relates to field-control "devices and particularly to arcing devices for high-voltage insulators. 7

One object of my invention is to provide a device of the above-indicated character that shall keep arcs away from the insulator independently of the magnetic fields set up by thearcs. V

Another object ofmy invention is to pro tect the upper "end of a series of superposed insulator disks or flanges against damage by ares. H

Another object of my invention is to pro- Vide a field or arc-control device that-shall effectively control arcs of both low and highcuri'ent values.

Another object of my invention is to utilize convection, caused by the heat of an arc, in controlling the arc. y

Another object of my invention is to provide an insulator arc-control device that shall cause the arc to climb upwardly and away from the insulator. H

Another object of my invention is provide an arcing horn that shall have "curved portions of such radiusas to reduce corona 'vide a field-control device that shall be siniple and durablein construction, economical I tors, particularly of the so-called seriesstrin suspension type, protection against arcs ol the upper ends thereof has been attempted by horns and rings of various types, all of Which, to the bestjof my knowledge, either extend merely laterally or laterally and downwardly, none of them extending both upwardly and then downwardly in accordance with my invention hereinafter set forth, 7 g V in the former structures, with the highest part of the'upper horn or radial ring support near the insulator and with an arc of relatively sm'all'current value, the hot gases of the arc tend to rise by; convection, carrying the are upwardly and inwardly to a po- FIELD eom or. nev -tor.

1928. Serial No. 289,320.

sition where damage may be done to the insulating material.

- These small-current arcs do not induce sufficient magnetic field to offset the convec tion caused by the heat of the are, aindthe device is, therefore, useless for protection,

of former are or field control devices, "as

above outlined, and, accordingly, I provide a device in which one of the terminals is so constructed asto keep "the arcs away from the insulator, whetherthese arcs have relatively high or relatively low current values.

Figure l of the accompanying drawings is. a top plan view oft-a field-control device constructed 'inaccordance with my invention.

Fig. 2 is a longitudinal side elevational view of the device shown in Fig. 1, and

'ified formofmy invention.

Referring to Figs. 1 and 2, the device'co'mprises, in general, an insulator 2, a bottom clamp "device 3 for supporting a transmission-line conductor 4 and upper'and lower arcing-horns or "field-control terminals 5 and 6', respectively. b I

The insulator 2 may be pi any suitable type,"being here depicted, for purposes of '1llustration,as of a usual series-string type embodying a plurality of flexibl connected units each comprisingadielectrie having a laterally-extending disk or Petticoat 8,

a metal cap 9 and an inner meta pin 10.

Each pin 10 is provided with an eye for connection, by a transverse pin 12,1:0 a'clevis 14 on the cap of the next lower unit or to the clamp-3, and the'tdp eievis 14 isfor attachment to-a main supporting cross arm of a pole or tower (not shown) I .The 1ower field-control devices may be of another "shape but ispreferably formed from Fig. '3 is a view, similar to Fig. 2,015 a mod a single metal strap or bar having a central portion secured in position by bolts 16, which also clamp the conductor 4 in the clamp 3, and upwardly and outwardly projecting portions 17 terminating in gradually-curved outer-end portions 18.

As indicated more clearly in Fig. 2, by rea son of the central location of the portion 15 of the lower terminal 6 beneath the clamp 3 and the central location of the portions 18 over the conductor at, portions 19 thereof curve laterally from the mid portion 15 and back again to the portion 17 around the conductor 4.

The upper terminal member 5, to which my invention more particularly relates, comprises rod or bar members 21 and 22 projecting laterally from the insulator and each having an inner end 23 disposed at one side and inwardly beyond the inner end of the other, adjacent to which ends, complementary curved or clamping portions 2% fit the upper cap 9 and are held in position by bolts 25. This construction provides a sim ple two-piece horn structure which facilitates manufacture and installation and re duces the clamping parts to substantially a minimum.

Each bar 22, from a position adjacent to the top cap 9, has a gradually bent or upwardly extending portion 27 merging into a gradually return-bent top portion 28 and, from the portion 28, into a downwardly and outwardly sloping portion 29, and a gradually upwardly curved end or tip 80 which lies below the clamping portion 2 1 of the bar.

In operation, upon discharge and with a small are-current value, the arc rises by convection so that its upper end plays back and forth in the region of the upper bend 28. This action keeps the are free of the top disk or petticoat 8 to prevent damage thereto.

With a discharge or are current of relatively high value, the magnetic field, caused thereby in the arc and horns, forces the arc outwardly along the portion 29 to the tip 30, during which travel, or after reaching a position between the tips 30 and 18, it is extinguished or dissipated.

The bends in the horns are of such radius as to reduce the formation of corona thereon.

In the modification of my invention illusi rated in Fig. 3, in which corresponding parts are designated by corresponding reference characters, the construction and operation are substantially the same as in the structure above described.

However, in this form, in which the device is shown as a dead-end insulator, the insulator may lie, in general, in a diagonal or substantially horizontal position, in which case, the horns at lower side of the longitudinal axis thereof may be omitted. This structure causes the arcs to operate between the upper horns substantially as above described, since, when the weak-current are strikes near the portion 27, it is carried by convection toward the portion 28, and the magnetic field of a strong-current are, assisted by convection in this case, forces it upwardly or outwardly from the insulator, as in the first form.

In the above-described structure, in which the parts are substantially no greater in magnitude or number, no more diflicult or expensive to manufacture or install and no more complicated than prior-art structures, a device is obtained, by simple means, which is of materially more effective operation than many of the devices heretofore employed.

iVhile I have shown and. described particular forms of my invention, changes may be effected therein without departing from the spirit and scope thereof, as set forth in the appended claims.

I claim as my invention:

1. An electrostaticfield control device comprising spaced electrodes one of which has an inner portion adjacent to the longitudinal axis of the device, a portion extending from said inner portion to a position laterally at one side, and longitudinally removed from, said inner portion in a direction away from the other electrode and a portion extending from said position toward said other elec' trode to a position longitudinally spaced from said other electrode.

2. An electrostatic field control device comprising spaced electrodes one of which has an inner portion adjacent to the longi tudinal axis of the device, a portion extending from said inner portion to a position laterally at one side, and longitudinally removed from, said inner portion in a direction away from the other electrode and a portion extending from said position toward said other electrode to a position longitudinally closer to said other terminal than said inner portion but longitudinally spaced from said other electrode.

3. In combination with an insulator, upper and lower electrodes, the upper electrode having an inner port-ion adjacent to the longitudinal axis of the insulator, a portion extending upward from said inner portion, a portion extending downward from said upwardly-extending portion and an outerend portion below said inner portion and above the lower electrode, the upper portion of the upper electrode carrying the arcs during relatively low-current discharges and said end carrying the arcs during relatively high-current discharges.

4. In combination with an insulator, upper and lower electrodes, the upper electrode having an inner portion adjacent to the longitudinal axis of the insulator, a portion extending upward from said inner portion. a portion extending downward from said upwardly-extending portion and an outerend portion below'said inner portion and,

above the lower electrode, the upper portion of the upper electrode carrying thearcs during relatively low-current discharges and said end carrying the arcs during relatively high-current discharges, the lower electrode having a portion extending upwardly at one side of the insulator.

5. In combination with an insulator, an upper arcing horn comprising a single integral metal member havin an inner portion secured to the insulator ad acent to the longitudinal axis thereof, a portion gradually curved upwardly from said inner portion, said upwardly-bent portion having a top gradual return-bend portion and a portion extending downwardly and outwardly from said top portion to a position below said inner portion.

6. In combination with an insulator, an upper arcing horn comprising a single integral metal member having an inner portion secured to the insulator adjacent to the longitudinal axis thereof, a portion gradually curved upwardly from said inner portion, said upwardly-bent portion having a top gradual return-bend portion, a portion extending downwardly and outwardl from said top portion to a position below said inner portion and an outer end portion curving gradually upwardly from said downwardlyextending portion.

7. An electrostatic field control device comprising spaced electrodes one of which has an inner portion adjacent to the longitudinal axis of the device, an intermediate portion extending from said inner portion away from said other electrode and an outer portion extending from said intermediate portion toward said other electrode to a position longitudinally removed therefrom.

8. An electrostatic field control device comprising spaced electrodes one of which has an inner portion adjacent to the longitudinal axis of the device, an intermediate portion extending from said inner portion away from said other electrode and an outer por' tion extending from said intermediate portion toward said other electrode to a position longitudinally removed therefrom, there being rounded portions between said inner and intermediate portions, between said portion toward said other eral direction substantially parallel to said axis and to strike said portion free from the.

insulator, a second portion extending from said first portion and away from the other electrode and 'a third portion extending from said second portion toward said other electrode to a fourth portion that is closer to the other electrode than said laterally-spaced portion.

In testimony whereof, I have hereunto subscribed my name this 20th day of June, 1928.

RICHARD W. CARLISLE.

intermediate and outer portions and atthe outer end of said outer portion.

9. In combination with an insulator, elec- V 7 said first portion and away from the other electrode and a third portion extending 

